“My mum brought me to the gym because there was a lot of gang violence in the area and my cousin was stabbed just after his GCSEs and my mum did not want me on that route.

“She brought me here and I loved it, even the smell of the gym.

“People in the gym always say you can be a world champion, even if you are rubbish and I had never heard nice words like that from my mum or teachers when I was young so it was encouraging and felt nice.

“I used to come back to the gym just so I could hear those words of encouragement again and again.”

Now the encouragement comes thick and fast, as do the sparring invitations from some of the planet's best boxers.

For this camp, Chamberlain went to the Ukraine to learn from pound-for-pound ace Vasyl Lomanchenko and cruiserweight king Oleksandr Usyk.

There are rounds with Deontay Wilder and Anthony Joshua already under his belt and when SunSport visits Miguel’s Gym under the Brixton train arches, he has done another ten after an eight-mile run.

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Most fighters grow up mimicking Muhammad Ali, but few emulate his appetite for social change and improvement.

But Chamberlain quotes the legend when explaining how – whether February 3 brings success or failure – he will remain dedicated to the sport and the area that helped carve him out of what looks like granite.

Quoting Ali, Chamberlain said: “’Service to others is the rent you pay for your room here’.

“So I will help anyone trying to come up and do right.

“I am one of the least egotistical people around, I am always helping my community.